/*******************************************************************************
 * Copyright 2017 Bstek
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/
package com.bstek.urule.parse.decisiontree;

import com.bstek.urule.model.decisiontree.ActionTreeNode;
import com.bstek.urule.model.decisiontree.ConditionTreeNode;
import com.bstek.urule.model.decisiontree.TreeNodeType;
import com.bstek.urule.model.decisiontree.VariableTreeNode;
import com.bstek.urule.model.rule.Op;
import com.bstek.urule.parse.Parser;
import com.bstek.urule.parse.ValueParser;
import org.dom4j.Element;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Jacky.gao
 * @since 2016年2月26日
 */
public class ConditionTreeNodeParser implements Parser<ConditionTreeNode> {
    private ValueParser valueParser;
    private VariableTreeNodeParser variableTreeNodeParser;
    private ActionTreeNodeParser actionTreeNodeParser;

    @Override
    public ConditionTreeNode parse(Element element) {
        ConditionTreeNode node = new ConditionTreeNode();
        node.setNodeType(TreeNodeType.condition);
        node.setOp(Op.valueOf(element.attributeValue("op")));
        List<ConditionTreeNode> conditionTreeNodes = new ArrayList<ConditionTreeNode>();
        List<ActionTreeNode> actionTreeNodes = new ArrayList<ActionTreeNode>();
        List<VariableTreeNode> variableTreeNodes = new ArrayList<VariableTreeNode>();
        for (Object obj : element.elements()) {
            if (obj == null || !(obj instanceof Element)) {
                continue;
            }
            Element ele = (Element) obj;
            String name = ele.getName();
            if (valueParser.support(name)) {
                node.setValue(valueParser.parse(ele));
            } else if (support(name)) {
                ConditionTreeNode cn = parse(ele);
                cn.setParentNode(node);
                conditionTreeNodes.add(cn);
            } else if (variableTreeNodeParser.support(name)) {
                VariableTreeNode vn = variableTreeNodeParser.parse(ele);
                vn.setParentNode(node);
                variableTreeNodes.add(vn);
            } else if (actionTreeNodeParser.support(name)) {
                ActionTreeNode an = actionTreeNodeParser.parse(ele);
                an.setParentNode(node);
                actionTreeNodes.add(an);
            }
        }
        if (conditionTreeNodes.size() > 0) {
            node.setConditionTreeNodes(conditionTreeNodes);
        }
        if (actionTreeNodes.size() > 0) {
            node.setActionTreeNodes(actionTreeNodes);
        }
        if (variableTreeNodes.size() > 0) {
            node.setVariableTreeNodes(variableTreeNodes);
        }
        return node;
    }

    public void setValueParser(ValueParser valueParser) {
        this.valueParser = valueParser;
    }

    public void setActionTreeNodeParser(
            ActionTreeNodeParser actionTreeNodeParser) {
        this.actionTreeNodeParser = actionTreeNodeParser;
    }

    public void setVariableTreeNodeParser(
            VariableTreeNodeParser variableTreeNodeParser) {
        this.variableTreeNodeParser = variableTreeNodeParser;
    }

    @Override
    public boolean support(String name) {
        return name.equals("condition-tree-node");
    }
}
